can't start projection based route

[meysam2594]

hi there !
first of all thank you for your great library :)
when i start projection based route i have this error :

Attempt to invoke interface method 'java.lang.ref.WeakReference com.amalbit.trail.contract.GooglemapProvider.getGoogleMapWeakReference()' on a null object reference

i just want to have polyline like this with effect and animation